[#2815] add hasText()

[emeroad]

#2815

[codecov-io]

Codecov Report

Merging #3220 into master will increase coverage by 0.02%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master   #3220      +/-   ##
=========================================
+ Coverage   38.88%   38.9%   +0.02%     
=========================================
  Files        2061    2061              
  Lines       67821   67829       +8     
  Branches     9455    9458       +3     
=========================================
+ Hits        26372   26390      +18     
+ Misses      38849   38842       -7     
+ Partials     2600    2597       -3

Impacted Files	Coverage Δ
...om/navercorp/pinpoint/common/util/StringUtils.java	92.42% <100%> (+4.49%)	⬆️
...navercorp/pinpoint/rpc/common/SocketStateCode.java	80.48% <0%> (-2.44%)	⬇️
...rp/pinpoint/rpc/server/PinpointServerAcceptor.java	72.72% <0%> (-0.61%)	⬇️
...point/rpc/client/DefaultPinpointClientHandler.java	71.91% <0%> (+0.3%)	⬆️
...corp/pinpoint/rpc/stream/StreamChannelManager.java	72.41% <0%> (+1.72%)	⬆️
...m/navercorp/pinpoint/test/OrderedSpanRecorder.java	74.03% <0%> (+1.92%)	⬆️
...ofiler/sender/StandbySpanStreamDataSendWorker.java	83.58% <0%> (+2.98%)	⬆️
...p/pinpoint/rpc/client/WriteFailFutureListener.java	75% <0%> (+18.75%)	⬆️

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